Question

In a flaccid cell, which condition does not occur?
(A) $TP = 1$
(B) $SP = 0$
(C) $SP = OP$
(D) None of the above

Answer 1

Hint: When the cell is in flaccid condition, the diffusion pressure deficit is equal to the osmotic pressure of the solution since the turgor pressure of the flaccid cell is zero. The water moves from the lower diffusion pressure deficit to the higher-pressure deficit.

Complete answer:
The diffusion pressure deficit is defined as the difference between the diffusion pressure of a solution and the diffusion pressure of the pure solvent. This DPD is found only at the same atmospheric temperature. A cell is supposed to be flaccid when it is put in a hypertonic arrangement of solution and cell sap moves out of it through the process of exosmosis. This causes an expansion in the dispersion pressure deficiency, with the end goal that the DPD gets equivalent to the osmotic potential and the turgor pressure gets zero. The turgor pressure is most extreme in the turgid cell and zero in the flaccid cell. Hence, the suction potential is zero and it is equal to the osmotic pressure. But the turgor pressure is zero.

Additional information: The osmotic pressure is the pressure applied to separate the solution from the pure solvent. It is done with the help of a semipermeable membrane. The turgor pressure is the weight applied by the tonoplast against the cell divider.

Hence, the correct answer is Option (A)

Note: The diffusion pressure deficit in a flaccid cell is always maximum. Since in the flaccid cell, the diffusion pressure deficit is equal to the osmotic pressure of the solution. This is because, turgor pressure in the flaccid cell is zero as in equilibrium.